import { createContext, forwardRef, useContext, useId, useMemo, type ComponentProps } from "react";
import { Legend, ResponsiveContainer, Tooltip } from "recharts";
import { cn } from "@/lib/utils";

// Type definitions for better TypeScript safety
type TooltipPayloadItem = {
	value?: number | string;
	name?: string;
	dataKey?: string;
	color?: string;
	payload?: Record<string, unknown>;
	[key: string]: unknown;
};

type LegendPayloadItem = {
	value?: string;
	dataKey?: string;
	color?: string;
	[key: string]: unknown;
};

// Format: { THEME_NAME: CSS_SELECTOR }
const THEMES = { light: "", dark: ".dark" } as const;

export type ChartConfig = {
	[k in string]: {
		label?: React.ReactNode;
		icon?: React.ComponentType;
	} & ({ color?: string; theme?: never } | { color?: never; theme: Record<keyof typeof THEMES, string> });
};

type ChartContextProps = {
	config: ChartConfig;
};

const ChartContext = createContext<ChartContextProps | null>(null);

function useChart() {
	const context = useContext(ChartContext);

	if (!context) {
		throw new Error("useChart must be used within a <ChartContainer />");
	}

	return context;
}

const ChartContainer = forwardRef<
	HTMLDivElement,
	ComponentProps<"div"> & {
		config: ChartConfig;
		children: ComponentProps<typeof ResponsiveContainer>["children"];
	}
>(({ id, className, children, config, ...props }, ref) => {
	const uniqueId = useId();
	const chartId = `chart-${id || uniqueId.replace(/:/g, "")}`;

	return (
		<ChartContext.Provider value={{ config }}>
			<div
				data-chart={chartId}
				ref={ref}
				className={cn(
					"[&_.recharts-cartesian-axis-tick_text]:fill-muted-foreground [&_.recharts-cartesian-grid_line[stroke='#ccc']]:stroke-border/50 [&_.recharts-curve.recharts-tooltip-cursor]:stroke-border [&_.recharts-polar-grid_[stroke='#ccc']]:stroke-border [&_.recharts-radial-bar-background-sector]:fill-muted [&_.recharts-rectangle.recharts-tooltip-cursor]:fill-muted [&_.recharts-reference-line_[stroke='#ccc']]:stroke-border flex aspect-video justify-center text-xs [&_.recharts-dot[stroke='#fff']]:stroke-transparent [&_.recharts-layer]:outline-none [&_.recharts-sector]:outline-none [&_.recharts-sector[stroke='#fff']]:stroke-transparent [&_.recharts-surface]:outline-none",
					className
				)}
				{...props}
			>
				<ChartStyle id={chartId} config={config} />
				<ResponsiveContainer>{children}</ResponsiveContainer>
			</div>
		</ChartContext.Provider>
	);
});
ChartContainer.displayName = "Chart";

const ChartStyle = ({ id, config }: { id: string; config: ChartConfig }) => {
	const colorConfig = Object.entries(config).filter(([, config]) => config.theme || config.color);

	if (!colorConfig.length) {
		return null;
	}

	return (
		<style
			dangerouslySetInnerHTML={{
				__html: Object.entries(THEMES)
					.map(
						([theme, prefix]) => `
${prefix} [data-chart=${id}] {
${colorConfig
	.map(([key, itemConfig]) => {
		const color = itemConfig.theme?.[theme as keyof typeof itemConfig.theme] || itemConfig.color;
		return color ? `  --color-${key}: ${color};` : null;
	})
	.join("\n")}
}
`
					)
					.join("\n"),
			}}
		/>
	);
};

const ChartTooltip = Tooltip;

const ChartTooltipContent = forwardRef<
	HTMLDivElement,
	{
		active?: boolean;
		payload?: TooltipPayloadItem[];
		label?: string | number;
		labelFormatter?: (value: React.ReactNode, payload: TooltipPayloadItem[]) => React.ReactNode;
		labelClassName?: string;
		formatter?: (
			value: string | number | undefined,
			name: string | undefined,
			props: TooltipPayloadItem,
			index: number,
			payload: Record<string, unknown>
		) => React.ReactNode;
		className?: string;
		hideLabel?: boolean;
		hideIndicator?: boolean;
		indicator?: "line" | "dot" | "dashed";
		nameKey?: string;
		labelKey?: string;
		color?: string;
	}
>(
	(
		{
			active,
			payload,
			className,
			indicator = "dot",
			hideLabel = false,
			hideIndicator = false,
			label,
			labelFormatter,
			labelClassName,
			formatter,
			color,
			nameKey,
			labelKey,
		},
		ref
	) => {
		const { config } = useChart();

		const tooltipLabel = useMemo(() => {
			if (hideLabel || !payload || !Array.isArray(payload) || payload.length === 0) {
				return null;
			}

			const item = payload[0];
			if (!item) {
				return null;
			}
			const key = `${labelKey || item.dataKey || item.name || "value"}`;
			const itemConfig = getPayloadConfigFromPayload(config, item, key);
			const value = !labelKey && typeof label === "string" ? config[label]?.label || label : itemConfig?.label;

			if (labelFormatter) {
				return <div className={cn("font-medium", labelClassName)}>{labelFormatter(value, payload)}</div>;
			}

			if (!value) {
				return null;
			}

			return <div className={cn("font-medium", labelClassName)}>{value}</div>;
		}, [label, labelFormatter, payload, hideLabel, labelClassName, config, labelKey]);

		if (!active || !payload || !Array.isArray(payload) || payload.length === 0) {
			return null;
		}

		const nestLabel = payload.length === 1 && indicator !== "dot";

		return (
			<div
				ref={ref}
				className={cn(
					"border-border/50 bg-background grid min-w-[8rem] items-start gap-1.5 rounded-lg border px-2.5 py-1.5 text-xs shadow-xl",
					className
				)}
			>
				{!nestLabel ? tooltipLabel : null}
				<div className="grid gap-1.5">
					{payload.map((item: TooltipPayloadItem, index: number) => {
						const key = `${nameKey || item.name || item.dataKey || "value"}`;
						const itemConfig = getPayloadConfigFromPayload(config, item, key);
						const indicatorColor = color || item.payload?.fill || item.color;

						return (
							<div
								key={item.dataKey || index}
								className={cn(
									"[&>svg]:text-muted-foreground flex w-full flex-wrap items-stretch gap-2 [&>svg]:h-2.5 [&>svg]:w-2.5",
									indicator === "dot" && "items-center"
								)}
							>
								{formatter && item?.value !== undefined && item.name ? (
									formatter(item.value, item.name, item, index, item.payload || {})
								) : (
									<>
										{itemConfig?.icon ? (
											<itemConfig.icon />
										) : (
											!hideIndicator && (
												<div
													className={cn("shrink-0 rounded-[2px] border-[--color-border] bg-[--color-bg]", {
														"h-2.5 w-2.5": indicator === "dot",
														"w-1": indicator === "line",
														"w-0 border-[1.5px] border-dashed bg-transparent": indicator === "dashed",
														"my-0.5": nestLabel && indicator === "dashed",
													})}
													style={
														{
															"--color-bg": indicatorColor,
															"--color-border": indicatorColor,
														} as React.CSSProperties
													}
												/>
											)
										)}
										<div
											className={cn(
												"flex flex-1 justify-between leading-none",
												nestLabel ? "items-end" : "items-center"
											)}
										>
											<div className="grid gap-1.5">
												{nestLabel ? tooltipLabel : null}
												<span className="text-muted-foreground">{itemConfig?.label || item.name}</span>
											</div>
											{item.value && (
												<span className="text-foreground font-mono font-medium tabular-nums">
													{typeof item.value === "number" ? item.value.toLocaleString() : item.value}
												</span>
											)}
										</div>
									</>
								)}
							</div>
						);
					})}
				</div>
			</div>
		);
	}
);
ChartTooltipContent.displayName = "ChartTooltip";

const ChartLegend = Legend;

const ChartLegendContent = forwardRef<
	HTMLDivElement,
	React.ComponentProps<"div"> & {
		payload?: LegendPayloadItem[];
		verticalAlign?: "top" | "bottom";
		hideIcon?: boolean;
		nameKey?: string;
	}
>(({ className, hideIcon = false, payload, verticalAlign = "bottom", nameKey }, ref) => {
	const { config } = useChart();

	if (!payload || !Array.isArray(payload) || payload.length === 0) {
		return null;
	}

	return (
		<div
			ref={ref}
			className={cn("flex items-center justify-center gap-4", verticalAlign === "top" ? "pb-3" : "pt-3", className)}
		>
			{payload.map((item: LegendPayloadItem, index: number) => {
				const key = `${nameKey || item.dataKey || "value"}`;
				const itemConfig = getPayloadConfigFromPayload(config, item, key);

				return (
					<div
						key={item.value || index}
						className={cn("[&>svg]:text-muted-foreground flex items-center gap-1.5 [&>svg]:h-3 [&>svg]:w-3")}
					>
						{itemConfig?.icon && !hideIcon ? (
							<itemConfig.icon />
						) : (
							<div
								className="h-2 w-2 shrink-0 rounded-[2px]"
								style={{
									backgroundColor: item.color,
								}}
							/>
						)}
						{itemConfig?.label}
					</div>
				);
			})}
		</div>
	);
});
ChartLegendContent.displayName = "ChartLegend";

// Helper to extract item config from a payload.
function getPayloadConfigFromPayload(config: ChartConfig, payload: unknown, key: string) {
	if (typeof payload !== "object" || payload === null) {
		return undefined;
	}

	const payloadPayload =
		"payload" in payload && typeof payload.payload === "object" && payload.payload !== null
			? payload.payload
			: undefined;

	let configLabelKey: string = key;

	if (key in payload && typeof payload[key as keyof typeof payload] === "string") {
		configLabelKey = payload[key as keyof typeof payload] as string;
	} else if (
		payloadPayload &&
		key in payloadPayload &&
		typeof payloadPayload[key as keyof typeof payloadPayload] === "string"
	) {
		configLabelKey = payloadPayload[key as keyof typeof payloadPayload] as string;
	}

	return configLabelKey in config ? config[configLabelKey] : config[key];
}

export { ChartContainer, ChartLegend, ChartLegendContent, ChartStyle, ChartTooltip, ChartTooltipContent };
